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The top of the haze layer in the eastern USA is usually below 10,000' but occasionally it can extend considerably higher.  Daytime convection will sometimes lift the haze layer.  The vertical mixing can cause the top of the haze layer to become less defined.  Sometimes scattered buildups will drag haze up with them creating local areas of diffuse haze that extend well above the denser surrounding haze layer.  Sometimes such lifted haze will later become stratified into a then haze layer that remains distinct from the lower haze layer.  This picture was taken at 6,500' just skimming the top of the haze layer somewhere in Georgia heading back to Atlanta.